Fresh from embarrassing President Obama and damaging a central piece of the Democrat’s assault on Mitt Romney, the headline-grabbing Newark mayor took out an ad in the New Jersey directory of delegates at the convention and misspelled – of all things – the president’s name!

“Re-Elect President Barak Obama,” the ad reads, missing the C in Barack.

Booker is delivering a brief speech as the convention opens tomorrow and is making the scene as the most prominent member of New Jersey’s convention delegation.

His office did not respond to a message from The Post.

Booker has been deep in the dog house with Obama since May when he told a national TV audience that the president’s attacks on Romney’s business record were “nauseating” and made him “very uncomfortable.” Booker has been trying to get back on the president’s good side since then.